Power Supplies comparison
Compare power supplies — wattage, 80+ efficiency rating, modularity, ATX 3.0 support, and warranty.
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Best power supplies right now
What matters when comparing power supplies
This power supplies page covers 17 products and compares the measurable fields that most often separate one model from another: wattage, efficiency, modular, form factor, atx 3.0 / 12vhpwr. Use the filters to narrow the field, open a product page for the complete readout, and use a head-to-head page when two models are close enough that a category-wide rank is not enough.
How to read the ranking
Mars Score is a normalized category score, not a laboratory replacement and not a claim that the highest-ranked product is right for every buyer. A high score indicates broad strength across the weighted fields; a lower score can still be the better choice when one specific requirement matters more than the average.
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Brands in power supplies
How to choose a power supply in 2026
The PSU is the most underweighted component in most builds — and the only one whose failure can take the rest of the system with it. The Mars Score weights wattage headroom, efficiency rating, modularity, ATX 3.0/3.1 support, and warranty.
Wattage sizing: 1.5× to 2× peak load
A modern RTX 4090 / 5090 + Core i9 / Ryzen 9 system pulls 600–750 W under simultaneous CPU+GPU load. Run a 1,000–1,200 W unit to keep the PSU in its high-efficiency band and to cover transient spikes. The Corsair RM1200x SHIFT and Seasonic PRIME TX-1300 are typical of this class.
Efficiency: 80+ Gold is enough; Titanium is luxury
80+ Gold (87–90% efficiency at 50% load) is the mainstream sweet spot. Titanium (94%+) saves a few watts but takes years to repay the premium in residential electricity. Pay for Titanium if you run the PC 24/7.
ATX 3.0 / ATX 3.1 and the 12V-2x6 connector
ATX 3.0 added the 12VHPWR connector for high-power GPUs; ATX 3.1 fixed the connector to 12V-2x6 with better mechanical retention. Buy ATX 3.1 (or use a high-quality cable adapter) for any 4090/5090-class card to reduce melted-connector risk.
Full vs semi vs non-modular
Fully modular cabling (RM1200x SHIFT, PRIME TX-1300 Noctua) is now the default at $150+. Semi-modular keeps the ATX 24-pin and CPU EPS hard-wired but saves money. Non-modular is fine for compact budget builds but messy in larger cases.
Form factor: ATX, SFX, SFX-L
Standard ATX for tower builds. SFX and SFX-L (Corsair SF1000L) for ITX cases — pay attention to clearance with bulky aftermarket GPUs.
Warranty as a quality proxy
10–12 year warranties (Seasonic PRIME, Corsair RM) signal high-tier internal components. Sub-5-year warranties on no-name brands signal the opposite. Never buy a PSU based on price alone.
How vsMars scores power supplies
Each score combines wattage, efficiency rating, modularity, ATX 3.x support, and warranty length per the methodology. Cross-reference with graphics cards for matched wattage targets and gaming PCs for full-system context.
Frequently asked
How many power supplies are catalogued on vsMars?+
17 power supplies from 8 brands are catalogued in this category, each with a complete spec sheet and a transparent Mars Score.
How are power supplies ranked?+
Each power supplie is scored by the category-specific Mars Score formula — a weighted average of normalized specs with the weights published on the methodology page. No editorial hand-tuning.
Which power supplie has the highest Mars Score right now?+
PRIME TX-1300 Noctua leads the power supplies category with a Mars Score of 91.5.
Can I compare two power supplies side by side?+
Yes — pick any two power supplies from the category list and the comparison page renders side-by-side specs, advantages on each side, and a Mars Score verdict.